[PATCH v4 0/4] s390x: Fix IRB sense data

[Eric Farman <farman@linux.ibm.com>]

Conny, et al,

Here is a quick update to the series for fixing passthrough
sense data in the irb, using a subchannel-specific callback.

As before, the first three patches are code refactoring.
Since patch 3 doesn't implement the callback for vfio-ccw
subchannels, it fixes the problem encountered with
"dasdfmt -M quick" failing to run correctly in the guest.
Since the callback isn't invoked for passthrough subchannels
the SCSW and ERW bits don't get set indicating sense data
is present, even though the sense data itself is still zero.

Patch 4 implements that for vfio-ccw.

v3->v4:
 - [CH] Rename ESW.sublog to ESW.word0
 - [CH] Add comment that ESW.f_addr and .s_addr are only Fmt0 ESW
 - [CH] Always copy ECW data into IRB to include mysterious
        "model-dependent information" that could exist there
 - [TH] Added r-b to patch 2 (thank you!!)

v2->v3:
 - [EF] Drop Fixes tag
 - [CH] Implement a callback for the IRB sense data
 - [CH] Copy IRB.ESW from passthrough hardware
 - [CH] Only put sense in IRB.ECW if passthrough device did

v1->v2:
 - [MR] Add Fixes: tags
 - [CH] Reinstate the memcpy(sch->sense_data, irb.ecw) in vfio_ccw
 - [CH] Look at IRB.SCSW.E before copying sense into guest IRB

v3: https://lore.kernel.org/qemu-devel/20210616014749.2460133-1-farman@linux.ibm.com/
v2: https://lore.kernel.org/qemu-devel/20210611202151.615410-1-farman@linux.ibm.com/
v1: https://lore.kernel.org/qemu-devel/20210610202011.391029-1-farman@linux.ibm.com/

Eric Farman (4):
  s390x/css: Introduce an ESW struct
  s390x/css: Split out the IRB sense data
  s390x/css: Refactor IRB construction
  s390x/css: Add passthrough IRB

 hw/s390x/3270-ccw.c       |  1 +
 hw/s390x/css.c            | 87 ++++++++++++++++++++++++++++-----------
 hw/s390x/s390-ccw.c       |  1 +
 hw/s390x/virtio-ccw.c     |  1 +
 hw/vfio/ccw.c             |  4 ++
 include/hw/s390x/css.h    |  5 +++
 include/hw/s390x/ioinst.h | 12 +++++-
 7 files changed, 86 insertions(+), 25 deletions(-)

-- 
2.25.1